The concept of PoS is very similar to PPoS: PPoS is averaged CP over the predictive distribution, whereas PoS is averaged power over the predictive distribution. Unlike PPoS, PoS is calculated at the beginning of the trial, and hence it only relies on the prior distribution of \(\theta \) . As mentioned before, the PoS has also been referred to as `assurance' [1]}, and `expected power' or `average success of probability' [2]}.
